Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c16661184db9b10…

MALICIOUS

PDF

53.3 KB Created: 2020-11-07 21:58:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6c45b4d46f705efce5cc499b2837a50e SHA-1: 289de9fffc2dace9526897e53b71cce019a2a149 SHA-256: 6c16661184db9b109704e995c405f496fffd86efc2d9927e7dc670c0999d9e6d
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffe.ru/aws?keyword=mario+download+free+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477173/normal_5fa65fc9409d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413719/normal_5fa1acad26600.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/b4b3eb38b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454047/normal_5f9f8e23bf961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_5f8cb87eda8ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f8e953607b11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5f8845f5e698b.pdfIn PDF document text
    • https://rizebilawi.weebly.com/uploads/1/3/0/8/130814716/muwunenitodilipuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383446/normal_5f8fcb0b695a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f42aaca6-7ec5-4452-81d1-4cb78edadfc3/78683542429.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/xoravuxaxawuketulixumir.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/kigowewot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/508c0a5b-beb0-41ac-92ec-b9b2939f0e42/aston_martin_vanquish_manual_conversion_for_sale.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000862d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x862D 4776 bytes
SHA-256: b85ba987cf5d8d0b278f23c046ac294b1e57442e9173c1379cd0c0048f6adf6d
font_01_sfnt_off00009681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9681 10876 bytes
SHA-256: a1f0c96b769aaa914a6832c176695e3621fbe3749c37b7fdebe54b013d717c51
font_02_sfnt_off0000ba62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA62 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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